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As the Austin bomber sensed that authorities were closing in on him on Tuesday night, he took out his cell phone and recorded a 25-minute video confessing to building the explosive devices -- but didn't explain why he targeted his victims, interim Austin police Chief Brian Manley said.

"It is the outcry of a very challenged young man talking about challenges in his life that led him to this point," the interim chief said. "I know everybody is interested in a motive and understanding why. And we're never going to be able to put a (rationale) behind these acts," Manley told reporters Wednesday night.

Police respond after one person was injured by a package containing an incendiary device at a nearby Goodwill store on March 20, 2018 in Austin, Texas. (Credit: Scott Olson/Getty Images)

The video made by Mark Anthony Conditt, whose string of package bombs killed two people and wounded five in Texas, was found on his cell phone when police recovered his body this morning. The cell phone was in Conditt's possession at the time of his death, police said.

Manley says that Conditt did not mention any references to terror groups or bring up hate.

Conditt killed himself after police tried to stop him early Wednesday in what investigators described as an explosion inside his car.

Federal agents went to the bomber's home Wednesday while police interviewed his roommates, attempting to determine whether any bombs remained and if Conditt acted alone.

Latest developments

• Authorities think they have accounted for every bomb Conditt made, Manley said.

• Conditt, 23, lived in Pflugerville,a city just outside Austin,according to public records and a longtime neighbor of his parents.

• An arrest warrant for Conditt and a criminal complaint charging him with one count of unlawful possession and transfer of a destructive device were filed Tuesday night, authorities said. An affidavit detailing the reasons for the warrant and charge is under seal, they said.

• An aunt of Conditt's said her family is "devastated and broken at the news that our family could be involved in such an awful way."

• Austin police on Wednesday morning conducted a "follow-up investigation" at the FedEx facility where an intact bomb was found a day earlier, the agency tweeted. The building was temporarily evacuated, but police said normal business "will resume."

• Conditt was an Austin Community College student from 2010 to 2012 but did not graduate, the school said.

No more bombs found

Fred Milanowski, the special agent in charge for the Bureau of Alcohol, Tobacco, Firearms and Explosives' Houston office, said one room in the house in Pflugerville where Conditt lived had components for making similar bombs to the ones that exploded in a string of incidents this month. There was also similar homemade explosive material in the room.

No finished bombs were found, he said.

Conditt detonated a bomb in his vehicle before dawn on the side of Interstate 35 in Round Rock, north of Austin, as police approached him, authorities said.

Authorities tracked Conditt to a hotel in Round Rock, about 20 miles north of Austin, after reportedly identifying him using receipts, internet searches, witness sketches and, ultimately, surveillance video that revealed he'd delivered packages days earlier to an area FedEx store, officials said.

Authorities were outside the hotel early Wednesday when Conditt got in his vehicle and drove away. They followed him until he pulled into a ditch and blew himself up, police said. The blast injured a SWAT officer.

The bombings -- five over nearly three weeks, with some involving packages left on Austin doorsteps -- had driven the area to near-panic.

Video and an intact package may have helped ID Conditt

Video of a man dropping off two packages Sunday at a location described by CNN affiliate WOAI as a FedEx store south of Austin appears to have played a major role in helping investigators identify Conditt.

The surveillance images show a man wearing gloves, a black T-shirt and a cap taking two packages into the shop. WOAI published the surveillance images, and Austin Mayor Steve Adler told CNN that police believe the person in the images was responsible for the Texas bombings.

Police haven't explicitly said what happened to the packages in that video. But early Tuesday, in the last known explosion before Conditt killed himself, a package exploded on an automated conveyor at a FedEx sorting center near San Antonio, slightly injuring a worker there.

Also Tuesday, an unexploded package bomb was discovered at another FedEx facility near Austin.

"Police say that they used that (video) as the final piece to put all of this together, really in the past 24 hours," Tony Plohetski, an investigative reporter for the Austin American-Statesman, told CNN's "New Day."

FedEx said it provided authorities with "extensive evidence" from its security system on the packages and the person who shipped them.

The explosions

The first three explosions in Austin involved cardboard packages left in front yards or on porches. The parcels weren't delivered by the US Postal Service or services such as UPS or FedEx, police have said.

The first explosion killed Anthony Stephan House, 39; the second killed Draylen Mason, 17; and the third critically injured a 75-year-old woman. Police have not ruled out the possibility that those bombings could be hate crimes.

The fifth explosion happened early Tuesday at the FedEx sorting facility near San Antonio.

Conditt's family 'devastated'

One of Conditt's aunts released a prepared statement Wednesday, saying his relatives were "devastated and broken at the news that our family could be involved in such an awful way."

"We had no idea of the darkness that Mark must have been in," the statement reads. "Our family is a normal family in every way. We love, we pray, and we try to inspire and serve others.

"Right now our prayers are for those families that have lost loved ones, for those impacted in any way, and for the soul of our Mark. We are grieving and we are in shock. Please respect our privacy as we deal with this terrible, terrible knowledge and try to support each other through this time."

Editor's note: This story has been updated to correct Mark Anthony Conditt's age to 23, based on public records. Earlier, police identified the suspect as a 24-year-old man.